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公开(公告)号：US4150289A
公开(公告)日：1979-04-17
申请号：US800746
申请日：1977-05-26
申请人： Peter J. Rosauer , John J. Flaherty
发明人： Peter J. Rosauer , John J. Flaherty
CPC分类号： G01B15/02
摘要： A method and apparatus for calibrating a gamma ray inspection system for measuring the wall thickness of a tubular product such as a pipe or the like, the system including a gamma ray beam generating station, means for conveying a tubular product axially past the gamma ray beam, the gamma ray generator being rotated during the axial movement of the tubular product, means for detecting the amount of attenuation of the gamma rays passing through the tubular product, and a calibration block having a first portion with a thickness corresponding to twice the nominal wall thickness of the tubular product to be inspected, and a second portion having a thickness corresponding to a predetermined amount less than the nominal wall thickness. Means are provided for selectively introducing the first portion and the second portion of the calibration block into the gamma ray beam to enable the operator to calibrate the equipment and to be able to detect tubular products which are defective in terms of thickness.
摘要翻译： 一种用于校准伽马射线检查系统的方法和装置，用于测量诸如管道等的管状产品的壁厚，所述系统包括伽马射线束产生站，用于沿轴向传送管状产品通过伽马射线束 ，所述伽马射线发生器在所述管状产品的轴向移动期间旋转，用于检测通过所述管状产品的伽马射线的衰减量的装置，以及校准块，其具有对应于所述标称壁的两倍的厚度的第一部分 要检查的管状产品的厚度，以及具有对应于小于标称壁厚的预定量的厚度的第二部分。 提供了用于选择性地将校准块的第一部分和第二部分引入伽马射线束的装置，以使得操作者能够校准设备并且能够检测在厚度方面有缺陷的管状产品。
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公开(公告)号：US4193306A
公开(公告)日：1980-03-18
申请号：US952844
申请日：1978-10-19
申请人： John J. Flaherty , Eric J. Strauts
发明人： John J. Flaherty , Eric J. Strauts
CPC分类号： G01S15/50 , G01N29/0609
摘要： An ultrasonic system for detection of defects is provided including a pulse-echo instrument having a cathode ray tube on which an A-scan visual indication of flaws is produced and including a doppler circuit arranged to produce a doppler signal in an audible range in response to movement of a transducer relative to defects in a pipe seam or other region being investigated. The doppler signal is applied to earphones, permitting the existence of defects to be reliably determined audibly, after which the defects may be more carefully studied through the visual indications on the cathode ray tube. The doppler signal is also recorded on one track of a magnetic tape with operator's comments being recorded on a second track of the same tape. The doppler circuit includes an oscillator operated during a gating time interval to generate a reference signal, a phase detector responsive to a reference signal and to echo ignals, and a sample and hold circuit for storing the output of the phase detector from one cycle to the next.
摘要翻译： 提供了一种用于检测缺陷的超声波系统，包括具有阴极射线管的脉冲回波仪器，在该脉冲回波仪器上产生瑕疵的A扫描视觉指示，并且包括多普勒电路，该多普勒电路被布置为响应于可听见的范围产生多普勒信号 传感器相对于正在研究的管缝或其他区域中的缺陷的运动。 多普勒信号被应用于耳机，允许可听见地确定缺陷的存在，之后可以通过阴极射线管上的视觉指示更仔细地研究缺陷。 多普勒信号也被记录在磁带的一个轨道上，操作者的意见被记录在同一磁带的第二轨道上。 多普勒电路包括在门控时间间隔期间操作以产生参考信号的振荡器，响应于参考信号和回波点的相位检测器，以及采样和保持电路，用于将相位检测器的输出从一个周期存储到 下一个。
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3.发明授权Conductivity measuring instrument having linearization means and a digital read-out 失效具有线性化和数字读出功能的电导率测量仪器
公开(公告)号：US4074186A
公开(公告)日：1978-02-14
申请号：US614877
申请日：1975-09-19
申请人： John J. Flaherty
发明人： John J. Flaherty
CPC分类号： G01R27/02
摘要： Conductivity measuring instruments are provided in which a test coil is supplied with alternating current and a detector responds to the voltage across the test coil to develop an analog voltage which is applied to a linearization circuit to develop an output voltage as a linear function of conductivity, the output voltage being applied to a digital read-out unit. As a function of conductivity, the analog voltage is single-valued, preferably with no more than a gradual slope change over a wide range of conductivity values. In one embodiment, a high impedance is provided in series with the test coil, the detector is a phase detector operated to respond primarily to the inductive component and linearization circuit is of a diode-function type. Alternatives are in the use of a phase-to-voltage type of detector and in the use of a digital type of detector and in the use of a digital type of linearization circuit.
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4.发明授权Non-destructive testing systems having automatic balance and sample and hold operational modes 失效具有自动平衡和采样和保持操作模式的非破坏性测试系统
公开(公告)号：US4006407A
公开(公告)日：1977-02-01
申请号：US556898
申请日：1975-03-10
申请人： John J. Flaherty , Eric J. Strauts
发明人： John J. Flaherty , Eric J. Strauts
摘要： Automatic balancing circuits are provided for non-destructive testing systems such as eddy current systems in which an unbalance of a probe circuit including a test coil produces undesired deviations from a null indication. Error signal components are generated from a probe circuit output signal, stored in storage means and then applied in a balancing direction to cancel the effect of the unbalance of the probe circuit. Preferably, the error signal components are generated by a pair of quadrature phase detectors and the storage means comprises either a capacitor or the combination of digital storage and digital-analog converter means. The balancing is performed either automatically, with a delay in the storage operation, or by operation of a switch means between a sample or null condition in which the error signals are stored and a hold condition in which the stored error signals are applied. In one embodiment, the stored error signals are used to modulate AC signal components in quadrature phase relation which are applied in a balancing direction. In another, the stored error signals are developed from phase detector output signals and then combined therewith. In both embodiments, balancing signals are combined with signals derived from the probe circuit output signal and applied at points preceding high gain amplification in signal processing circuitry.
摘要翻译： 为非破坏性测试系统（例如涡流系统）提供自动平衡电路，其中包括测试线圈的探头电路的不平衡产生与空指示的不期望的偏差。 误差信号分量由探头电路输出信号产生，存储在存储装置中，然后以平衡方向施加，以消除探针电路不平衡的影响。 优选地，误差信号分量由一对正交相位检测器产生，并且存储装置包括电容器或数字存储器和数模转换器装置的组合。 平衡可以自动执行，存储操作延迟，或者通过操作存储错误信号的采样或空条件之间的开关装置以及应用存储的误差信号的保持条件来执行。 在一个实施例中，所存储的误差信号用于调制在平衡方向上应用的正交相位关系中的交流信号分量。 另一方面，存储的误差信号从相位检测器输出信号产生，然后与其组合。 在两个实施例中，平衡信号与从探测电路输出信号导出的信号组合，并在信号处理电路中的高增益放大之前的点应用。
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公开(公告)号：US4378700A
公开(公告)日：1983-04-05
申请号：US204950
申请日：1980-11-07
申请人： John J. Flaherty , Eric J. Strauts
发明人： John J. Flaherty , Eric J. Strauts
CPC分类号： G01N27/9046
摘要： An indicating system is disclosed for use with nondestructive testing systems of various types including an eddy current instrument in which the characteristics of a specimen structure are indicated by the form, position and dimensions of a trace on a screen. The system indicates whether or not the relationship of two test signals is within certain limits which can be shown in the form of outlines or a series of contiguous boxes on a screen. Prior to the testing of a structure of unknown characteristics, such limits may be learned or recorded by the system either during the manual manipulation of a joystick control or the like or during the testing of a structure of known or standard characteristics.
摘要翻译： 公开了一种用于各种类型的非破坏性测试系统的指示系统，包括涡流仪器，其中样本结构的特征由屏幕上的迹线的形式，位置和尺寸指示。 该系统指示两个测试信号的关系是否在一定限度内，可以以轮廓的形式或屏幕上的一系列连续的框显示。 在测试未知特征的结构之前，系统可以在手动操纵操纵杆控制等期间或者在测试已知或标准特征的结构期间学习或记录这样的限制。
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公开(公告)号：US4372658A
公开(公告)日：1983-02-08
申请号：US347541
申请日：1982-02-10
IPC分类号： G03B37/00
CPC分类号： G03B37/005
摘要： Pipeline inspection apparatus is provided including a camera unit and associated illumination means, preferably a strobe flash unit, for recording on photographic film the rectangular images corresponding to generally rectangular internal surface portions of a pipe for detection of defects, a viewing axis of the camera being normal to the axis of the pipe. Weight means are provided for operating in a manner such as to establish a viewing axis in predetermined angular relation to a vertical plane through the axis of a horizontal pipe. In one embodiment, the device is supported by resilient cups for movement through the pipe and the entire device is rotatable under the influence of the weight means. In another embodiment, at least the optical portion of the camera unit is rotatably supported and connected to the weight means. Magnetic flaw detection means are provided for triggering the camera unit.
摘要翻译： 提供管道检查装置，其包括相机单元和相关联的照明装置，优选地是闪光灯闪光单元，用于在照相胶片上记录对应于用于检测缺陷的管道的大致矩形内表面部分的矩形图像，照相机的观察轴 垂直于管道的轴线。 提供了重量装置，以便通过水平管的轴线以垂直平面建立与预定角度关系的观察轴的方式操作。 在一个实施例中，该装置由弹性杯支撑以便通过该管道移动，整个装置可在重量装置的影响下旋转。 在另一个实施例中，照相机单元的至少光学部分被可旋转地支撑并连接到重量装置。 提供用于触发相机单元的磁性探伤装置。
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公开(公告)号：US4351031A
公开(公告)日：1982-09-21
申请号：US204946
申请日：1980-11-07
CPC分类号： G01N27/9053 , G01N27/9046
摘要： An eddy current type of nondestructive testing instrument is disclosed in which the operating frequency is automatically adjusted in accordance with a comparison of output signals obtained in scanning operations in which the frequency is adjusted over its range. The system may be used, for example, in providing lift-off compensation for conductivity measurements or flaw detection or it may be used for sorting of parts of different characteristics.
摘要翻译： 公开了一种涡流型无损检测仪器，其中根据在其范围内调整频率的扫描操作中获得的输出信号的比较来自动调整工作频率。 该系统可用于例如提供用于电导率测量或探伤的剥离补偿，或者可用于对不同特征的部件进行分选。
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公开(公告)号：US4249810A
公开(公告)日：1981-02-10
申请号：US881148
申请日：1978-02-27
IPC分类号： G03B37/00
CPC分类号： G03B37/005
摘要： Pipeline inspection apparatus is provided including a camera unit and associated illumination means, preferably a strobe flash unit, for recording on photographic film the images of internal surface portions of a pipe for detection of defects. The camera unit is moved longitudinally within a pipeline by a drive unit which preferably includes electric motors energized from a self-contained battery unit. Important features relate to means for automatically reversing the drive of the apparatus after it has travelled a predetermined distance and to mechanical features for facilitating movement of the device through bends and the like.
摘要翻译： 提供了管道检查装置，其包括相机单元和相关联的照明装置，优选地是闪光灯闪光单元，用于在照相胶片上记录用于检测缺陷的管道的内表面部分的图像。 相机单元通过驱动单元在管线内纵向移动，驱动单元优选地包括从独立电池单元供电的电动机。 重要的特征涉及在装置行进了预定距离后自动翻转装置的装置以及用于促进装置通过弯曲等的移动的机械特征的装置。
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公开(公告)号：US4123797A
公开(公告)日：1978-10-31
申请号：US773338
申请日：1977-03-01
申请人： Eric J. Strauts , John J. Flaherty
发明人： Eric J. Strauts , John J. Flaherty
摘要： A storage system is provided in which digital numbers are read into a memory by periodically sampling a pair of analog input signals and in which the memory is scanned in timed relation to the signal sampling and also in timed relation to the scanning of a cathode ray tube screen in a raster pattern, the scanning spot being brightened when a stored digital number is detected.A pair of digital-to-analog converters are used both in sampling and for raster scanning. In sampling, the outputs thereof are compared with the input signals to control analog-to-digital logic circuits and the inputs thereof are connected through multiplexers to the output of the analog-to-digital logic circuits which operate as successive approximation registers. In raster scanning, the inputs of the digital-to-analog converters are connected to counter sections driven from a high frequency clock one being operative to develop a sawtooth signal to generate a sweep line and the other being operative at a field or frame rate. The memory is also connected through the multiplexers, alternately to the outputs of the analog-to-digital logic circuits and to the counters to be scanned in synchronism with the scanning of the screen. The multiplexers are so switched that sampling is performed between successive sweep lines.
摘要翻译： 提供了一种存储系统，其中通过周期性地对一对模拟输入信号进行采样而将数字数字读入存储器，并且其中存储器以与信号采样成正比的关系扫描存储器，并且还与阴极射线管的扫描定时关系 以光栅图案进行屏幕显示，当检测到存储的数字数字时，扫描点变亮。
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